Stool



FIG. 1 is a perspective view of a stool;

FIG. 2 is a front view thereof, the rear view being a mirror image;

FIG. 3 is a top view thereof;

FIG. 4 is a side view thereof, the opposite side view being a mirror image; and,

FIG. 5 is a bottom view thereof. 

The ornamental design for a stool, as shown and described. 